Handheld electromechanical surgical instruments

Abstract

A surgical instrument includes a power pack, an outer shell housing configured to selectively encase the power pack, and an adapter assembly configured to selectively couple the outer shell housing to a loading unit. The outer shell housing includes a motor and a drive shaft coupled to and rotatable by the motor. The outer shell housing includes a drive member supported in a distal portion thereof. The drive member is configured to selectively couple to the drive shaft. The adapter assembly has a drive member supported in its proximal end. The drive member of the adapter assembly is configured to selectively couple to the drive member of the outer shell housing such that rotation of the drive shaft actuates movement of the drive member of the adapter assembly via the drive member of the outer shell housing.

What is claimed is: 
     
       1. A surgical instrument, comprising:
 a power pack including:
 an inner handle housing; 
 a motor disposed in the inner handle housing; and 
 a drive shaft partially disposed in the inner handle housing and coupled to and rotatable by the motor; 
 
 an outer shell housing configured to encase the power pack therein, the outer shell housing including a first drive member having a distal end disposed outside of and distal of the inner handle housing of the power pack, the first drive member being supported in a distal portion of the outer shell housing, the first drive member being configured to selectively couple to the drive shaft; and 
 an adapter assembly having a proximal end configured to couple to a distal end of the outer shell housing, and a distal end configured to couple to a loading unit, the adapter assembly having a second drive member supported in the proximal end, the second drive member being configured to selectively couple to the distal end of the first drive member such that rotation of the drive shaft actuates the second drive member through the first drive member, wherein the first drive member is non-rotatably supported by the distal portion of the outer shell housing such that the first drive member is prevented from rotating relative to the outer shell housing about a longitudinal axis defined by the first drive member. 
 
     
     
       2. The surgical instrument according to  claim 1 , wherein the outer shell housing is transitionable between an open configuration, in which the power pack is at least one of insertable or removable from the outer shell housing, and a closed configuration, in which the power pack is enclosed within the outer shell housing. 
     
     
       3. The surgical instrument according to  claim 2 , wherein the outer shell housing has a proximal portion pivotably coupled to the distal portion of the outer shell housing such that in the open configuration, a portion of the proximal portion of the outer shell housing is spaced from a corresponding portion of the distal portion of the outer shell housing and in the closed configuration, the portion of the proximal portion of the outer shell housing is connected to the corresponding portion of the distal portion of the outer shell housing. 
     
     
       4. The surgical instrument according to  claim 2 , wherein in the closed configuration, the drive shaft is operably connected to the first drive member and in the open configuration, the drive shaft is disconnected from the first drive member. 
     
     
       5. The surgical instrument according to  claim 1 , wherein rotation of the drive shaft axially moves the first drive member when the first drive member is operably connected to the drive shaft of the power pack. 
     
     
       6. The surgical instrument according to  claim 1 , wherein the drive shaft is a lead screw. 
     
     
       7. The surgical instrument according to  claim 6 , wherein the first drive member of the outer shell housing is an elongated nut threadingly engaged to the lead screw such that rotation of the lead screw axially moves the elongated nut relative to the lead screw.